(19)

(11)

EP 3 025 171 A1

(12)

(43) Date of publication: 01.06.2016 Bulletin 2016/22 (21) Application number: 14744084.6 (22) Date of filing: 24.07.2014

(51) International Patent Classification (IPC):  G01V 1/38(2006.01) (86) International application number: PCT/EP2014/065977 (87) International publication number: WO 2015/011247 (29.01.2015 Gazette 2015/04)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 26.07.2013 US 201361858841 P 14.01.2014 US 201461927200 P 09.04.2014 US 201461977285 P (71) Applicant: CGG Services SA 91300 Massy (FR)	(72) Inventors: GRENIÉ, Damien F-91300 Massy (FR) MENSCH, Thomas F-91300 Massy (FR) SILIQI, Risto F-91300 Massy (FR) (74) Representative: Petit, Maxime  BREMA-LOYER Le Centralis 63 Avenue du Général Leclerc 92340 Bourg-La-Reine 92340 Bourg-La-Reine (FR)